( | x | − | 500 | ) | ( | 100 | − | x | ÷ | 100 | ) | − | x | = | 404000 |
方程左边 = | x | ( | 100 | − | x | ÷ | 100 | ) | − | 500 | ( | 100 | − | x | ÷ | 100 | ) | − | x |
= | x | × | 100 | − | x | x | ÷ | 100 | − | 500 | ( | 100 | − | x | ÷ | 100 | ) | − | x |
= | 99 | x | − | x | x | × | 1 100 | − | 500 | ( | 100 | − | x | ÷ | 100 | ) |
= | 99 | x | − | x | x | × | 1 100 | − | 500 | × | 100 | + | 500 | x | ÷ | 100 |
= | 99 | x | − | x | x | × | 1 100 | − | 50000 | + | 5 | x |
= | 104 | x | − | x | x | × | 1 100 | − | 50000 |
104 | x | − | x | x | × | 1 100 | − | 50000 | = | 404000 |